Hi all,

I'm testing cache with hibernate, but from hibernate logging, I think it is not finding the entities in ehcache:

2004-03-15 15:48:20,430 DEBUG [net.sf.hibernate.impl.SessionImpl] loading [Processo#277]
2004-03-15 15:48:20,430 DEBUG [net.sf.hibernate.impl.SessionImpl] attempting to resolve [Processo#277]
2004-03-15 15:48:20,430 DEBUG [net.sf.hibernate.cache.ReadWriteCache] Cache lookup: 277
2004-03-15 15:48:20,430 DEBUG [net.sf.ehcache.hibernate.Plugin] key: 277
2004-03-15 15:48:20,430 DEBUG [net.sf.ehcache.store.MemoryStore] ProcessoCache: MemoryStore hit for 277
2004-03-15 15:48:20,430 DEBUG [net.sf.ehcache.store.MemoryStore] ProcessoCache: MemoryStore hit for 277
2004-03-15 15:48:20,431 DEBUG [net.sf.hibernate.cache.ReadWriteCache] Cached item was locked: 277
2004-03-15 15:48:20,431 DEBUG [net.sf.hibernate.impl.SessionImpl] object not resolved in any cache [Processo#277]
2004-03-15 15:48:20,431 DEBUG [net.sf.hibernate.persister.EntityPersister] Materializing entity: [Processo#277]

Am I missing something??

I'm using hibernate 2.1.2, ehcache 0.7 and jboss 3.2.3

Thanks in advance.

You should be more specific

Hi Emmanuel.

Well, from this log, I'm seeing that hibernate is querying ehcache for an entity and ehcache seems to find it as it says:

ProcessoCache: MemoryStore hit for 277

But Hibernate seems to be not finding it as Hibernate says:

object not resolved in any cache [Processo#277]

Is this the expected message output?


I got this log when trying to reload an object twice with Session.load. Later I tried with session.find.

Is there any test I can do which can show me if my entities are being cached correctly by ehcache and being used by hibernate?

Thanks in advance.

Hibernate enforces certain txn isolation semantics when reading from the cache. Looks like this (correct behavior) is the cause.

Hi Gavin.

Thanks. Is there anything I can do to make Hibernate to use ehcache instead?

I'm using DTO's to keep track of changes done in presentation. I later use my assembler to change back this DTO to an entity. To avoid me to track every change done in DTO and copy it back to entity, I'm using saveOrUpdateCopy to do that for me :) With this, Hibernate also can handle updates in collections and do the cascade-delete-orphan correctly to me.

The issue is to do that, Hibernate has to load the entity again, but as I already loaded it in a previous session I'd like hibernate get this entity loaded previously instead of hit the database again.


Is this possible?

Is there some way I can accomplish that?

Thanks in advance.

Handle your txns correctly and it will Just Work.

post code sample, copyproperties, transaction, opening session, commiting.

Here is what I'm trying to do:

I have the folowing: Entities translated to DTO and sent to presentation layer. In presentation, there may be modifications in collections in parent child relationships.

These DTO modifieds are sent back and processed. We have collections with cascade=all-delete-orphan.

Problem: If some child is removed, hibernate will not handle it as it won't know a child has been deleted. (with saveOrUpdate()). This is caused by the fact that the original hibernate collection has been lost in the entity <-> dto conversion.


In order I don't have to manually check for every collection modified in the parent child, I looked for an hibernate method which could do that for me. At least it seems that saveOrUpdateCopy() helped me with that. It could handle what has been changed even in the parent child collections! :) But obviously this didn't came for free... Hibernate has to load the entity again so it can do its magic :)

Here is where I came to the idea of using ehcache. This way, I could use the entity cache when hiberante loaded the entity the first time, which would avoid a database query when calling saveOrUpdateCopy() as the entity would be loaded from cache.

But entity still was being loaded from database :( And so I watched the logs and got that.

My transactions are being handled by jboss, I'm not using transaction API. I'm closing my sessions in finally blocks.

Am I missing something? Is what I'm trying to do possible or is it absurd?

Thanks in advance.

delpouve, my code is a simple hibernate usage with ehcache. But I will post the code here. I'm not in my devel box right now.

Regards,